Re: B&G Forward Scan Transducer Install

Jose Venegas
Alan, I agree with your observation. One thing I found is that in the settings using the chart plotter one can vary an angle which I imagine is the difference between the true vertical and the sensor alignment which varies with the boat attitude caused by its motion and weight distribution. Fiddling with that setting for a low motoring speed and calm waters makes the profile more stable and reliable.
Jose G Venegas Ipanema SM2K 278
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Re: B&G Forward Scan Transducer Install

Jose Venegas
Bill, When I bought my boat it came with a B&G 40 mm ID depth sensor and it did not appear to have been changed before. The B&G forward scanner that I bought had exactly that diameter and a length that was just enough to get in the perfect depth outside of the hull. So, what I had and what I bought had exactly the same diameter. I don't know why both sensors you mention have different diameters Jose G Venegas Ipanema SM2K 278
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Re: I ordered this on the 10 th from Amel

Randall SV ALBEDO
Circumnavigating the world, one part at a time.
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This is unbelievable . Here is the FedEx tracking history to St Maarten – still not there. Start at the bottom. Fair Winds Eric Kimberlite Amel Super Maramu #376 Thursday, February 3, 2022 1:42 AM MEMPHIS, TN In transit Wednesday, February 2, 2022 11:57 PM MEMPHIS, TN Arrived at FedEx hub 8:50 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit 4:40 AM NEWARK, NJ In transit 4:39 AM NEWARK, NJ Departed FedEx hub Tuesday, February 1, 2022 8:13 PM NEWARK, NJ Arrived at FedEx hub 4:59 PM MEMPHIS, TN Departed FedEx hub Sunday, January 30, 2022 5:02 AM MEMPHIS, TN Arrived at FedEx hub 12:59 AM ROISSY CHARLES DE GAULLE CEDEX FR In transit 12:02 AM ROISSY CHARLES DE GAULLE CEDEX FR In transit Saturday, January 29, 2022 5:23 AM MEMPHIS, TN In transit 5:13 AM MEMPHIS, TN Departed FedEx hub 1:26 AM MEMPHIS, TN In transit Friday, January 28, 2022 8:42 PM MEMPHIS, TN Arrived at FedEx hub 5:36 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit 5:13 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit Thursday, January 27, 2022 5:52 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit 5:52 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit 5:46 AM ROISSY CHARLES DE GAULLE CEDEX FR At local FedEx facility 3:30 AM ROISSY CHARLES DE GAULLE CEDEX FR At local FedEx facility 3:30 AM ROISSY CHARLES DE GAULLE CEDEX FR Operational Delay Wednesday, January 26, 2022 11:00 PM ROISSY CHARLES DE GAULLE CEDEX FR At local FedEx facility 5:06 AM MEMPHIS, TN In transit 4:32 AM MEMPHIS, TN Departed FedEx hub Tuesday, January 25, 2022 11:42 PM MEMPHIS, TN In transit 4:23 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit Monday, January 24, 2022 11:38 PM MEMPHIS, TN Arrived at FedEx hub 8:27 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit 8:20 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit Sunday, January 23, 2022 7:06 PM MEMPHIS, TN In transit 6:36 PM MEMPHIS, TN Departed FedEx hub Saturday, January 22, 2022 3:54 PM MEMPHIS, TN In transit 4:07 AM MEMPHIS, TN Arrived at FedEx hub Friday, January 21, 2022 12:10 PM NEWARK, NJ Departed FedEx hub 6:27 AM NEWARK, NJ Arrived at FedEx hub 4:16 AM ROISSY CHARLES DE GAULLE CEDEX FR In transit Thursday, January 20, 2022 11:03 AM INDIANAPOLIS, IN Departed FedEx hub 10:50 AM INDIANAPOLIS, IN In transit 2:46 AM INDIANAPOLIS, IN Arrived at FedEx hub Wednesday, January 19, 2022 5:11 PM MEMPHIS, TN Departed FedEx hub 7:23 AM MEMPHIS, TN In transit 3:47 AM MEMPHIS, TN In transit 1:56 AM MEMPHIS, TN In transit Package available for clearance 12:12 AM MEMPHIS, TN Arrived at FedEx hub Tuesday, January 18, 2022 2:39 PM COLE BAY SX In transit Thursday, January 13, 2022 7:58 PM COLE BAY SX Delay Rerouted to revised delivery address 9:08 AM COLE BAY SX At local FedEx facility Wednesday, January 12, 2022 8:23 PM COLE BAY SX At local FedEx facility 5:58 PM COLE BAY SX Clearance Delay Held, cleared regulatory agency(s) after aircraft/ truck departed. 2:44 PM COLE BAY SX In transit 12:30 PM CAROLINA, PR In transit 10:38 AM CAROLINA, PR At destination sort facility 5:09 AM MEMPHIS, TN Departed FedEx hub 2:06 AM MEMPHIS, TN In transit Tuesday, January 11, 2022 3:47 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit Package available for clearance 12:33 AM ROISSY CHARLES DE GAULLE CEDEX FR International shipment release - Export Monday, January 10, 2022 6:54 PM CHASSENEUIL DU POITOU FR Left FedEx origin facility 4:08 PM PERIGNY FR Picked up 4:07 PM CHASSENEUIL DU POITOU FR In transit 7:52 AM Shipment information sent to FedEx
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Re: I ordered this on the 10 th from Amel
That's bad. My delivery from LA Rochelle to New Zeand just over a week.
Danny
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On 04/02/2022 17:02 Eric Freedman <kimberlite@...> wrote:
This is unbelievable . Here is the FedEx tracking history to St Maarten – still not there.
Start at the bottom.
Fair Winds
Eric
Kimberlite Amel Super Maramu #376
Thursday, February 3, 2022 1:42 AM MEMPHIS, TN In transit Wednesday, February 2, 2022 11:57 PM MEMPHIS, TN Arrived at FedEx hub 8:50 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit 4:40 AM NEWARK, NJ In transit 4:39 AM NEWARK, NJ Departed FedEx hub Tuesday, February 1, 2022 8:13 PM NEWARK, NJ Arrived at FedEx hub 4:59 PM MEMPHIS, TN Departed FedEx hub Sunday, January 30, 2022 5:02 AM MEMPHIS, TN Arrived at FedEx hub 12:59 AM ROISSY CHARLES DE GAULLE CEDEX FR In transit 12:02 AM ROISSY CHARLES DE GAULLE CEDEX FR In transit Saturday, January 29, 2022 5:23 AM MEMPHIS, TN In transit 5:13 AM MEMPHIS, TN Departed FedEx hub 1:26 AM MEMPHIS, TN In transit Friday, January 28, 2022 8:42 PM MEMPHIS, TN Arrived at FedEx hub 5:36 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit 5:13 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit Thursday, January 27, 2022 5:52 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit 5:52 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit 5:46 AM ROISSY CHARLES DE GAULLE CEDEX FR At local FedEx facility 3:30 AM ROISSY CHARLES DE GAULLE CEDEX FR At local FedEx facility 3:30 AM ROISSY CHARLES DE GAULLE CEDEX FR Operational Delay Wednesday, January 26, 2022 11:00 PM ROISSY CHARLES DE GAULLE CEDEX FR At local FedEx facility 5:06 AM MEMPHIS, TN In transit 4:32 AM MEMPHIS, TN Departed FedEx hub Tuesday, January 25, 2022 11:42 PM MEMPHIS, TN In transit 4:23 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit Monday, January 24, 2022 11:38 PM MEMPHIS, TN Arrived at FedEx hub 8:27 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit 8:20 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit Sunday, January 23, 2022 7:06 PM MEMPHIS, TN In transit 6:36 PM MEMPHIS, TN Departed FedEx hub Saturday, January 22, 2022 3:54 PM MEMPHIS, TN In transit 4:07 AM MEMPHIS, TN Arrived at FedEx hub Friday, January 21, 2022 12:10 PM NEWARK, NJ Departed FedEx hub 6:27 AM NEWARK, NJ Arrived at FedEx hub 4:16 AM ROISSY CHARLES DE GAULLE CEDEX FR In transit Thursday, January 20, 2022 11:03 AM INDIANAPOLIS, IN Departed FedEx hub 10:50 AM INDIANAPOLIS, IN In transit 2:46 AM INDIANAPOLIS, IN Arrived at FedEx hub Wednesday, January 19, 2022 5:11 PM MEMPHIS, TN Departed FedEx hub 7:23 AM MEMPHIS, TN In transit 3:47 AM MEMPHIS, TN In transit 1:56 AM MEMPHIS, TN In transit Package available for clearance 12:12 AM MEMPHIS, TN Arrived at FedEx hub Tuesday, January 18, 2022 2:39 PM COLE BAY SX In transit Thursday, January 13, 2022 7:58 PM COLE BAY SX Delay Rerouted to revised delivery address 9:08 AM COLE BAY SX At local FedEx facility Wednesday, January 12, 2022 8:23 PM COLE BAY SX At local FedEx facility 5:58 PM COLE BAY SX Clearance Delay Held, cleared regulatory agency(s) after aircraft/ truck departed. 2:44 PM COLE BAY SX In transit 12:30 PM CAROLINA, PR In transit 10:38 AM CAROLINA, PR At destination sort facility 5:09 AM MEMPHIS, TN Departed FedEx hub 2:06 AM MEMPHIS, TN In transit Tuesday, January 11, 2022 3:47 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit Package available for clearance 12:33 AM ROISSY CHARLES DE GAULLE CEDEX FR International shipment release - Export Monday, January 10, 2022 6:54 PM CHASSENEUIL DU POITOU FR Left FedEx origin facility 4:08 PM PERIGNY FR Picked up 4:07 PM CHASSENEUIL DU POITOU FR In transit 7:52 AM Shipment information sent to FedEx
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I ordered this on the 10 th from Amel
Eric Freedman <kimberlite@...>
This is unbelievable . Here is the FedEx tracking history to St Maarten – still not there. Start at the bottom. Fair Winds Eric Kimberlite Amel Super Maramu #376 Thursday, February 3, 2022 1:42 AM MEMPHIS, TN In transit Wednesday, February 2, 2022 11:57 PM MEMPHIS, TN Arrived at FedEx hub 8:50 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit 4:40 AM NEWARK, NJ In transit 4:39 AM NEWARK, NJ Departed FedEx hub Tuesday, February 1, 2022 8:13 PM NEWARK, NJ Arrived at FedEx hub 4:59 PM MEMPHIS, TN Departed FedEx hub Sunday, January 30, 2022 5:02 AM MEMPHIS, TN Arrived at FedEx hub 12:59 AM ROISSY CHARLES DE GAULLE CEDEX FR In transit 12:02 AM ROISSY CHARLES DE GAULLE CEDEX FR In transit Saturday, January 29, 2022 5:23 AM MEMPHIS, TN In transit 5:13 AM MEMPHIS, TN Departed FedEx hub 1:26 AM MEMPHIS, TN In transit Friday, January 28, 2022 8:42 PM MEMPHIS, TN Arrived at FedEx hub 5:36 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit 5:13 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit Thursday, January 27, 2022 5:52 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit 5:52 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit 5:46 AM ROISSY CHARLES DE GAULLE CEDEX FR At local FedEx facility 3:30 AM ROISSY CHARLES DE GAULLE CEDEX FR At local FedEx facility 3:30 AM ROISSY CHARLES DE GAULLE CEDEX FR Operational Delay Wednesday, January 26, 2022 11:00 PM ROISSY CHARLES DE GAULLE CEDEX FR At local FedEx facility 5:06 AM MEMPHIS, TN In transit 4:32 AM MEMPHIS, TN Departed FedEx hub Tuesday, January 25, 2022 11:42 PM MEMPHIS, TN In transit 4:23 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit Monday, January 24, 2022 11:38 PM MEMPHIS, TN Arrived at FedEx hub 8:27 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit 8:20 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit Sunday, January 23, 2022 7:06 PM MEMPHIS, TN In transit 6:36 PM MEMPHIS, TN Departed FedEx hub Saturday, January 22, 2022 3:54 PM MEMPHIS, TN In transit 4:07 AM MEMPHIS, TN Arrived at FedEx hub Friday, January 21, 2022 12:10 PM NEWARK, NJ Departed FedEx hub 6:27 AM NEWARK, NJ Arrived at FedEx hub 4:16 AM ROISSY CHARLES DE GAULLE CEDEX FR In transit Thursday, January 20, 2022 11:03 AM INDIANAPOLIS, IN Departed FedEx hub 10:50 AM INDIANAPOLIS, IN In transit 2:46 AM INDIANAPOLIS, IN Arrived at FedEx hub Wednesday, January 19, 2022 5:11 PM MEMPHIS, TN Departed FedEx hub 7:23 AM MEMPHIS, TN In transit 3:47 AM MEMPHIS, TN In transit 1:56 AM MEMPHIS, TN In transit Package available for clearance 12:12 AM MEMPHIS, TN Arrived at FedEx hub Tuesday, January 18, 2022 2:39 PM COLE BAY SX In transit Thursday, January 13, 2022 7:58 PM COLE BAY SX Delay Rerouted to revised delivery address 9:08 AM COLE BAY SX At local FedEx facility Wednesday, January 12, 2022 8:23 PM COLE BAY SX At local FedEx facility 5:58 PM COLE BAY SX Clearance Delay Held, cleared regulatory agency(s) after aircraft/ truck departed. 2:44 PM COLE BAY SX In transit 12:30 PM CAROLINA, PR In transit 10:38 AM CAROLINA, PR At destination sort facility 5:09 AM MEMPHIS, TN Departed FedEx hub 2:06 AM MEMPHIS, TN In transit Tuesday, January 11, 2022 3:47 PM ROISSY CHARLES DE GAULLE CEDEX FR In transit Package available for clearance 12:33 AM ROISSY CHARLES DE GAULLE CEDEX FR International shipment release - Export Monday, January 10, 2022 6:54 PM CHASSENEUIL DU POITOU FR Left FedEx origin facility 4:08 PM PERIGNY FR Picked up 4:07 PM CHASSENEUIL DU POITOU FR In transit 7:52 AM Shipment information sent to FedEx
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Hello all, Picking up all the new rudder post packing from the local marine store here in Canada for my 54, This is my first repacking of the leaking and need to know the size of the packing material. Randall A54#56
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Martijn BoIt
Thanks a lot for this Brent! This one keeps me busy as I keep re-reading this 'entertaining' post. HaHa. It has a ton of information and a host of new words I can add to my vocabulary. :-D
Cheers, Martijn
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Re: Firefly Battery Update.
Hi Bill, we have the same batteries, have not yet done the restoration charge, will be soon. I have some questions, did you split the bank into two, to get a higher charge rate, also I am looking to turn off the refrigeration to not run them on the low voltage when draining the battery bank? I have a victron quattro that is a 120amp charger. Michael Nebo sm251
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Wow. Great Intel Bill. Thank you
Makes one rethink lithium in light of the insurance issues. Or at least consider the firefly a greatly improved bridge to wait for insurers to figure out the low risk reality of lithium.
Appreciated, Porter McRoberts S/V IBIS A54-152 WhatsApp:+1 754 265 2206 We have had some pretty extensive experience with our Firefly batteries at this point. We had a couple lumps and bumps in the road early on, but things now seem to have settled in to good smooth operation. One of the unusual things about using a Firefly battery is the procedure Firefly calls a “Restoration charge.” After an extended period of operating at partial state of charge, to restore full capacity the recommendation...
...perform the restoration charge: charge the G31 to 14.4V at 0.2C to 0.5C and continue to charge until the current drops to 0.5 A on the G31 and apply a float charge of 13.5V( for 24 hours. Fully discharge the battery to 10.5V, and then repeat the same charge cycle.
This is also the perfect time to actually measure the capacity of our batteries, and monitor their health since we are discharging them from 100% full to as close to 0% as you can get. For our battery bank we do this by turning on a 1000 Watt space heater, which pulls about 50 Amps out of our 480 Amp-hour battery bank draining them fully in a little under 10 hours.
For our 480 Amp-hour battery bank Firefly’s minimum recommended charger capacity is 96 Amps, and a maximum of 240 Amps, with an optimum target of 192 Amps. Our DC generator puts out 150 Amps, and our shore power inverter/charger does 70 Amps.
In Early October 2020 we installed our current set of Firefly batteries. After installation, initial charging and testing we did a full ”restoration charge” bringing the batteries from 100% full, down to dead flat, and recharging at 200 Amps
Firefly’s current specification sheet for the G31 version of their batteries lists the C10 capacity as 448 Amp-hours. Our first test in Oct 2020 came in at 454 Amp-hours. It seemed we were off to an excellent start. Our batteries managed to supply about 1% above rated capacity.
In April 21 after 6 months of use, we again ran a full discharge test, and the result was 459 Amp-hours. Even better! Obviously this was not a trend that could continue for long…
In Sep 21 after 10 months another test: 453 Amp-Hours.
Jan 22 at 15 months: 448 Amp Hours, right on the original rated nameplate capacity.
I do not have any feeling for how precise these numbers are. Are they +/- 1% or 10%? No idea. The measurement is a bit dicey, since I certainly do not have laboratory grade control of the discharge rate. So I can’t yet say if there is a real trend here or not. But the (very!) good news for us is after 15 months of constant use our batteries test out right at the original manufacturer’s capacity specification, or a tiny bit better!
Considering that an inexpensive set of flooded lead acid batteries would be approaching the end of their useful life at this age, we count this as a total win. Will these batteries last long enough to justify the additional cost? Maybe. Maybe not. But they are certainly on the right track.
For the way we use our boat, the performance of these seems to be an excellent match.
Bill Kinney SM160, Harmonie Hollywood, FL, USA
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Re: Firefly Battery Update.

Arno Luijten
Hi Bill,
Good to hear you have positive experiences with Firefly. Regrettably mine are not so positive as I had 8 of them in our Amel 54 but they were not up for the task. The voltage was getting below 24 V when the SOC came below 60-65% and we had any kind of load on the system (fridges mainly). In my case the internal resistance of the batteries seemed fairly high as the voltage dropped significant even at loads in the region of 10-25A. The guys from Firefly sent me a diagram that made it clear to me that these batteries are typically 0.2 V below AGM batteries and any SOC. After some discussion with them they basically told me these batteries were not suitable for my use-case. So for me this meant an usable capacity of about 120-150 Ah, not great on a power-hungry Amel 54. So after a year I decided to replace the batteries with 24V lithium units. Safe to say this was a very expensive experience.
Regards, Arno Luijten SV Luna, A54-121
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Randall SV ALBEDO
Hello all, Picking up all the new rudder post packing from the local marine store here in Canada for my 54, This is my first repacking of the leaking and need to know the size of the packing material. Randall A54#56
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Re: B&G Forward Scan Transducer Install
Jose,
I read your posting with interest and I have an important question.
The B&G pecs on the Forward Scanner state it requires a 50.8 mm hole. The B&G Depth Sounder that came with your SM requires a 32 mm hole. Apparently, the Depth Transducer on your SM was changed and the hole enlarged before you bought her. Can you confirm this? 
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Matt,
I installed the B&G forward scanner in place of the original B&G depth scanner and it fit perfectly. I mounted the old depth scanner behind the forward scanner To avoid having to make a new hole on the hull, I mounted the old scanner on a plastic tube that was glued with silicone to the hull and partially filled with water to create a transmission media for the ultrasound. Once in a while I need to put some water as it evaporates in over time.
The only thing that I need to do for the old scanner to work is to start it before the forward scanner. If I forget that, I can go to the chart plotter and temporarily suspend the forward scanner until the depth scanner starts. After that both scanners work. It is great to have the redundant information when you are entering unchartered areas.
To protect the forward scanner I fabricated a nest of 2 stainless rods aligned in the direction of the boat and screw it to the hull. I may still be hit by debris but less likely be damaged.
Jose Venegas
Ipanema SM2K 278
Currently in Redfrog marina, panama.
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Re: B&G Forward Scan Transducer Install

Jose Venegas
Matt, I installed the B&G forward scanner in place of the original B&G depth scanner and it fit perfectly. I mounted the old depth scanner behind the forward scanner To avoid having to make a new hole on the hull, I mounted the old scanner on a plastic tube that was glued with silicone to the hull and partially filled with water to create a transmission media for the ultrasound. Once in a while I need to put some water as it evaporates in over time. The only thing that I need to do for the old scanner to work is to start it before the forward scanner. If I forget that, I can go to the chart plotter and temporarily suspend the forward scanner until the depth scanner starts. After that both scanners work. It is great to have the redundant information when you are entering unchartered areas.
To protect the forward scanner I fabricated a nest of 2 stainless rods aligned in the direction of the boat and screw it to the hull. I may still be hit by debris but less likely be damaged.
Jose Venegas Ipanema SM2K 278 Currently in Redfrog marina, panama.
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Re: Silicone Bowthruster Seals Wanted !!
I need the silicone selas as well, in Europe.
Thanks
JP -- Jose Prieto SV Wayag, SM 323 Currently AguaDulce, Spain
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Silicone Bowthruster Seals Wanted !!

George Green
Does anyone have a set of seals available for sale suitable for my SM2K ? No rush. I will be in the USA until end June and Greece for the rest of the year
Many thanks in advance
George
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Re: Firefly Battery Update.

Porter McRoberts
Wow. Great Intel Bill. Thank you
Makes one rethink lithium in light of the insurance issues. Or at least consider the firefly a greatly improved bridge to wait for insurers to figure out the low risk reality of lithium.
Appreciated, Porter McRoberts S/V IBIS A54-152 WhatsApp:+1 754 265 2206Www.fouribis.net
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On Feb 3, 2022, at 2:27 PM, Bill Kinney <cruisingconsulting@...> wrote:
We have had some pretty extensive experience with our Firefly batteries at this point. We had a couple lumps and bumps in the road early on, but things now seem to have settled in to good smooth operation. One of the unusual things about using a Firefly battery is the procedure Firefly calls a “Restoration charge.” After an extended period of operating at partial state of charge, to restore full capacity the recommendation...
...perform the restoration charge: charge the G31 to 14.4V at 0.2C to 0.5C and continue to charge until the current drops to 0.5 A on the G31 and apply a float charge of 13.5V( for 24 hours. Fully discharge the battery to 10.5V, and then repeat the same charge cycle.
This is also the perfect time to actually measure the capacity of our batteries, and monitor their health since we are discharging them from 100% full to as close to 0% as you can get. For our battery bank we do this by turning on a 1000 Watt space heater, which pulls about 50 Amps out of our 480 Amp-hour battery bank draining them fully in a little under 10 hours.
For our 480 Amp-hour battery bank Firefly’s minimum recommended charger capacity is 96 Amps, and a maximum of 240 Amps, with an optimum target of 192 Amps. Our DC generator puts out 150 Amps, and our shore power inverter/charger does 70 Amps.
In Early October 2020 we installed our current set of Firefly batteries. After installation, initial charging and testing we did a full ”restoration charge” bringing the batteries from 100% full, down to dead flat, and recharging at 200 Amps
Firefly’s current specification sheet for the G31 version of their batteries lists the C10 capacity as 448 Amp-hours. Our first test in Oct 2020 came in at 454 Amp-hours. It seemed we were off to an excellent start. Our batteries managed to supply about 1% above rated capacity.
In April 21 after 6 months of use, we again ran a full discharge test, and the result was 459 Amp-hours. Even better! Obviously this was not a trend that could continue for long…
In Sep 21 after 10 months another test: 453 Amp-Hours.
Jan 22 at 15 months: 448 Amp Hours, right on the original rated nameplate capacity.
I do not have any feeling for how precise these numbers are. Are they +/- 1% or 10%? No idea. The measurement is a bit dicey, since I certainly do not have laboratory grade control of the discharge rate. So I can’t yet say if there is a real trend here or not. But the (very!) good news for us is after 15 months of constant use our batteries test out right at the original manufacturer’s capacity specification, or a tiny bit better!
Considering that an inexpensive set of flooded lead acid batteries would be approaching the end of their useful life at this age, we count this as a total win. Will these batteries last long enough to justify the additional cost? Maybe. Maybe not. But they are certainly on the right track.
For the way we use our boat, the performance of these seems to be an excellent match.
Bill Kinney SM160, Harmonie Hollywood, FL, USA
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|
We have had some pretty extensive experience with our Firefly batteries at this point. We had a couple lumps and bumps in the road early on, but things now seem to have settled in to good smooth operation. One of the unusual things about using a Firefly battery is the procedure Firefly calls a “Restoration charge.” After an extended period of operating at partial state of charge, to restore full capacity the recommendation...
...perform the restoration charge: charge the G31 to 14.4V at 0.2C to 0.5C and continue to charge until the current drops to 0.5 A on the G31 and apply a float charge of 13.5V( for 24 hours. Fully discharge the battery to 10.5V, and then repeat the same charge cycle.
This is also the perfect time to actually measure the capacity of our batteries, and monitor their health since we are discharging them from 100% full to as close to 0% as you can get. For our battery bank we do this by turning on a 1000 Watt space heater, which pulls about 50 Amps out of our 480 Amp-hour battery bank draining them fully in a little under 10 hours.
For our 480 Amp-hour battery bank Firefly’s minimum recommended charger capacity is 96 Amps, and a maximum of 240 Amps, with an optimum target of 192 Amps. Our DC generator puts out 150 Amps, and our shore power inverter/charger does 70 Amps.
In Early October 2020 we installed our current set of Firefly batteries. After installation, initial charging and testing we did a full ”restoration charge” bringing the batteries from 100% full, down to dead flat, and recharging at 200 Amps
Firefly’s current specification sheet for the G31 version of their batteries lists the C10 capacity as 448 Amp-hours. Our first test in Oct 2020 came in at 454 Amp-hours. It seemed we were off to an excellent start. Our batteries managed to supply about 1% above rated capacity.
In April 21 after 6 months of use, we again ran a full discharge test, and the result was 459 Amp-hours. Even better! Obviously this was not a trend that could continue for long…
In Sep 21 after 10 months another test: 453 Amp-Hours.
Jan 22 at 15 months: 448 Amp Hours, right on the original rated nameplate capacity.
I do not have any feeling for how precise these numbers are. Are they +/- 1% or 10%? No idea. The measurement is a bit dicey, since I certainly do not have laboratory grade control of the discharge rate. So I can’t yet say if there is a real trend here or not. But the (very!) good news for us is after 15 months of constant use our batteries test out right at the original manufacturer’s capacity specification, or a tiny bit better!
Considering that an inexpensive set of flooded lead acid batteries would be approaching the end of their useful life at this age, we count this as a total win. Will these batteries last long enough to justify the additional cost? Maybe. Maybe not. But they are certainly on the right track.
For the way we use our boat, the performance of these seems to be an excellent match.
Bill Kinney SM160, Harmonie Hollywood, FL, USA
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Re: Amel Maramu replacement waterlock

JB Duler
Richard, it may be simply catastrophic. Amel owners have lost their engine over saltwater back in the engine, especially during long downwind runs -- John Bernard "JB" Duler San Francisco Meltem # 19, Western Med
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Re: Fresh water tank pipe noise
I had that sound after the aft most water tank section on my 54 was cleaned. The copper pipe was pushed close to the vertical face of the tank by a monkey fisted boatyard worker during the cleaning process.
A little gentle bending got it far enough away that it doesn't touch anymore.
-- Scott 2007 A54 #69 SV Tengah http://www.svtengah.com
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Re: Amel Maramu replacement waterlock

Richard May
Bill, Interesting intel on the muffler. Thank you. The muffler I have also does not have a backflow preventer in it like the LSG models do. Are there ever issues with seawater coming backwards in the systems? -- Richard May SM 477 Avogato
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Re: DOES ANYONE KNOW WHY THE EMAILS i POST TO THE GROUP DO NOT SHOW UP?
Thanks JB. I'm not too worried. I just checked my spam folder.
Danny
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On 02/02/2022 13:04 JB Duler <jbduler@...> wrote:
Danny, most of the time the problem is not at the source but at the reception.
I don't know what Bill is using as an email service (Amazon SES? Mailgun? Sengrid?). But it works very well.
Email is way more complex than we tend to think. And it works well most of the time.
Who is handling the email for the domain xtra.co.nz? It may have worked in the past but very few email providers (beyond Microsoft and Gmail) have been able to keep up with tech. Don't forget that they have now to deal with billions of spam emails and they do an excellent job.
A solution is maybe to open a different email like dannyYvonneSimms@...?
--
John Bernard "JB" Duler
San Francisco
Meltem # 19, Western Med
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